Merlin compare themselves to Disney, why can't we hold them to that comparison?
There's clear reasoning why certain things at Merlin parks are prioritised, and that's to please the shareholders over the guests... Maintenance doesn't bring in the money (at least, not in the short term, providing regular maintenance over time prevents having to do one big cash drop when the ride is effectively condemned or when a child falls through the rotting fence), so what does that matter to the shareholders?
Comparing to other parks regardless of location is fine... The UK was basically inspiration for a lot of European parks after all (as well as the typical Disney influences) at the peak of the 90s powerhouse, why can't we now look to other parks for inspiration of how to build and run them?
Europa is an unique one because it is effectively a showroom... But Mack go above and beyond anything really; just look at the Old 99 retheme!